2002 Chevy Impala 3.8 overheating

Hi everyone,I have a 2002 Chevy Impala 3.8 overheating when stops at the light.I replaced the radiator May 2016,and i just replaced the Fan last week.After replacing the Fan I noticed one Fan wasn't spinning and the car started overheating,after reading some topics online I traced the Ground wire connectedto the Fan cleaned it and now both fans works. Now the overheat at the light andI feel like the Fan Vibrates.PS:1 code came up P0108 I replaced the Map sensor yet still vibrate and overheat.P.S: I've been riding all winter with the DexCool GM approved.

All you can do for the fans is to try and secure them better, but if the vibration is from the one fan you just purchased, it may be out of balance. So I would complain and try and get another one. If the vibration is cause by the air flow, then securing it better is all you can do.

Could be the intake manifold gaskets failing. These engines are
notorious for that. Especially if you're between 90,000 and 120,000
miles. Do you have a "sweeping" temperature gauge? That is does it
go up and down drastically? You may also have air trapped in the
cooling system. Have you replaced the PCV valve that sits directly
under the MAP sensor? It may be clogged. HTH. -Jim

Yes the Car is above 160000 miles,no digits
on the meter it goes up to 3/4 and back to
half never in the red. I don't think the Car
has Air trapped in the Cooling system.
But the problem is the intake manifold or
the PCV valve,the Car would have gave me
a code?

By 160,000 miles the intake manifold gaskets have probably already
been done. The MAP sensor plugs directly into the top of the PCV
valve housing. If the valve is badly clogged the MAP sensor may not
be getting any vacuum. That could be why you got the code for the
MAP sensor. You may want to inspect or replace the water pump.
The impeller on the water pump of my 2000 Grand Prix GT (same
engine) was badly rusted away. I'll try to post a picture of the old
one. The water pump gave no symptoms of failure other than what
you're describing. My Grand Prix was doing the same thing.
Temperature gauge would climb to almost the 260°F (top) at idle.
Then rapidly fall to below the 1/4 mark when I accelerated. Once
cruising it would be normal again until I stopped for a traffic light.
HTH. -Jim

Thank you Jim,I will definitely check it out.
Another Detail but it might be a different
problem I've been driving with a bad A/C
Fan switch for a year now. In order to get
heat or A/C in the Car the Fan speed needs
to be on 3, or 4 5 the 1 and 2 don't work.
3 weeks ago the Fan started making some
loud Noises.
Noise

You're welcome. Glad to help. The fan switch for the heat/air
conditioning won't have anything to do with the radiator cooling
fans. Selecting recirculate on the control panel should start the
radiator cooling fans immediately. You can also, for testing
purposes, unplug the coolant temperature sensor. Start the engine.
The check engine light will come on, ignore it. With the sensor
unplugged the radiator fans should both start immediately and run
on high speed. HTH. -Jim

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Hi everyone,
I have a 2002 Chevy Impala 3.8
overheating when stops at the light.
I replaced the radiator May 2016,
and i just replaced the Fan last week.
After replacing the Fan I noticed one
Fan wa...

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